101421220 has 12 divisors (see below), whose sum is σ = 212984604. Its totient is φ = 40568480.

The previous prime is 101421209. The next prime is 101421233. The reversal of 101421220 is 22124101.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 64770304 + 36650916 = 8048^2 + 6054^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 101421220.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2535511 + ... + 2535550.

It is an arithmetic number, because the mean of its divisors is an integer number (17748717).

Almost surely, 2^101421220 is an apocalyptic number.

101421220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101421220 is an abundant number, since it is smaller than the sum of its proper divisors (111563384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

101421220 is a wasteful number, since it uses less digits than its factorization.

101421220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5071070 (or 5071068 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 101421220 is about 10070.8102951054. The cubic root of 101421220 is about 466.3474540353.

Adding to 101421220 its reverse (22124101), we get a palindrome (123545321).

The spelling of 101421220 in words is "one hundred one million, four hundred twenty-one thousand, two hundred twenty".